How does timing and scoreboard equipment work in Water Polo?

Section 3: Playing Area

Men’s field: 30 m × 20 m (98.4 ft × 65.6 ft) for FINA/World Aquatics and Olympic competitions
Women’s field: 25 m × 20 m (82 ft × 65.6 ft) for FINA/World Aquatics and Olympic competitions
Domestic and junior competitions may use shorter fields (minimum 20 m × 10 m)
Minimum water depth: 1.80 m (5.9 ft); preferably 2.0 m (6.6 ft) or deeper — players must not touch or push off the bottom at any time
Water temperature: 25–27 °C (77–81 °F) for international competition

2 m line (red/red markers): Marks the zone in front of each goal; ordinary fouls by the attacking team inside this area result in a free throw at the 2 m line
5 m line (yellow markers): Penalty throw line; also defines the zone where exclusion fouls that prevent probable goals are upgraded to penalty throws
6 m line: Direct free-throw line used for certain restart situations
Half-distance line (white): Center of the field; used for restarts after goals and at the beginning of each period
Re-entry area: Marked on each side of the pool near the goal lines, where excluded players re-enter after serving their exclusion or when possession changes

Visible shot clock (30-second countdown) displayed on both sides of the pool
Game clock showing actual playing time per period
Electronic scoreboard visible to teams, officials, and spectators
Buzzer or audible signal system for shot clock expiration, period end, and timeout signals

Men’s field: 30 m × 20 m (98.4 ft × 65.6 ft) for FINA/World Aquatics and Olympic competitions
Women’s field: 25 m × 20 m (82 ft × 65.6 ft) for FINA/World Aquatics and Olympic competitions
Domestic and junior competitions may use shorter fields (minimum 20 m × 10 m)
Minimum water depth: 1.80 m (5.9 ft); preferably 2.0 m (6.6 ft) or deeper — players must not touch or push off the bottom at any time
Water temperature: 25–27 °C (77–81 °F) for international competition

2 m line (red/red markers): Marks the zone in front of each goal; ordinary fouls by the attacking team inside this area result in a free throw at the 2 m line
5 m line (yellow markers): Penalty throw line; also defines the zone where exclusion fouls that prevent probable goals are upgraded to penalty throws
6 m line: Direct free-throw line used for certain restart situations
Half-distance line (white): Center of the field; used for restarts after goals and at the beginning of each period
Re-entry area: Marked on each side of the pool near the goal lines, where excluded players re-enter after serving their exclusion or when possession changes

Visible shot clock (30-second countdown) displayed on both sides of the pool
Game clock showing actual playing time per period
Electronic scoreboard visible to teams, officials, and spectators
Buzzer or audible signal system for shot clock expiration, period end, and timeout signals